NTSB

Probable Cause: The failure of both pilots to see and avoid each other resulting in a collision on the airstrip. Contributing was the pilots’ failure to announce their intentions over their radios as they were taking off and landing.

Probable Cause: A total loss of engine power due to fuel starvation as a result of the pilot’s modifications to the fuel system. Contributing to the accident was the pilot’s decision to continue the takeoff despite observing lower than anticipated propeller rpm, his decision to delay his precautionary landing to allow another airplane to land, and his decision to conduct flight testing of the airplane following multiple modifications.

Probable Cause: The pilot’s exceedance of the airplane’s critical angle of attack during the takeoff, which resulted in an aerodynamic stall and loss of airplane control at too low of an altitude to recover.

Probable Cause: The pilot’s exceedance of the airplane’s critical angle of attack, which resulted in an aerodynamic stall and loss of aircraft control.

Probable Cause: The stabilator trim rod assembly separated from the stabilator link assembly due to a missing connecting bolt, which resulted in the pilot’s inability to maintain pitch control of the airplane.

Probable Cause: The pilot’s failure to remove the wheel chocks before engine start which resulted in the inadvertent contact with the propeller while the engine was running.

Probable Cause: A total loss of engine power caused by fatigue cracking and fracture of the crankshaft due to severe wear of the bearings.